DOC: add maintainers for QUIC and HTTP/3

Frédéric Lécaille and Amaury Denoyelle are the official maintainers of
QUIC and HTTP/3.
diff --git a/MAINTAINERS b/MAINTAINERS
index ad9a8a0..c56ac24 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -125,6 +125,15 @@
       for the code itself. He should be consulted for questions regarding the
       exporter integration into HAProxy, as well as for the bugs.
 
+QUIC and HTTP/3
+Maintainer: Frédéric Lécaille <flecaille@haproxy.com>
+Maintainer: Amaury Denoyelle <adenoyelle@haproxy.com>
+Files: src/quic*.c, src/cfgparse-quic.c, include/haproxy/quic*.h
+Files: src/mux_quic.c, include/haproxy/mux_quic.h,
+Files: src/proto_quic.c, include/haproxy/proto_quic.h
+Files: src/xprt_quic.c, include/haproxy/xprt_quic.h
+Files: src/h3*.c, include/haproxy/h3*.h
+
 ScientiaMobile WURFL Device Detection
 Maintainer: Paul Borile, Massimiliano Bellomi <wurfl-haproxy-support@scientiamobile.com>
 Files: addons/wurfl, doc/WURFL-device-detection.txt